Recording pen



Sept. 11', 1928. 1,683,828

a. B. IRELAND RECORDING? Original Filed Ju1 22, 1926 INVENTOR: W B. M;

jq mmmav Patented Sept. 11, 1928.

c- U T STATES PATENT, OFFICE.

GEORGE n. mELAnn, 1*; Rocnnsmnn, new YORK, ASSIGNOR To marine-INSTRUMENT coxmmms; or'nocnns'rnn, NEW YORK; A corrronarroiv or nnwy'sronx,

- RECORDING rim.

Original application name 22, i926 Serial no. 124,229; Diyided and this i 927. Serial No. 175,842.;

V i This applicationrelates generally l mechanism adapted for making graphic'recs ids or torlike purposes andmore inparticular to pen mechanism tor co operation with highly-sensitive and delicateelements having a ii'elatiyelyaweak operating lorce.

It the general object'of theinvention to provide a penand pen arm which operateswitlran exceedingly light pressure and requires a very small force for operation- For aifull understanding of the invention,

reference is made to the accompanying drawings wherein a i Fig. 1 is a plan View of one form of the invention; i i x y Fig. 2 is a side-view thereof; 7

Fig. 3 is a cross sectionon a larger scale. taken online 3-3, Fig.1;

Fig. 4 is'a plan View otanother torm; i

Fig; 5 is a sideview'thereof; and

Fig. 6 is a cross section on a larger scale,

taken on line 6-45, Fig. 4. In, the drawings ,1 represents a ,pen arm as celluloid or material having generally the physical characteristics of celluloid. Atthe outer end the arm 1 is formed with a conical depression 2 or indentation defining corresponding protuberance wlneh is prov1ded with a vfineincision 3 extendingnwardly from the point of the cone. .The wall of he protuberance preferably has asmaller thickness than. thearmjn While there is, of course, a good deal olt'latitudein regard to the thickness of the arm and ofithe protuberance defined by the 1ndenta't1on 2, I found a thicknessot about 01 for the former and .a thickness of about .005. for

stamped out fromthin sheet material such" application; filed Hatch 16,

or. othersimilarly thin-edged cutting blade. so finethatink or other like liquid does not, under the actiongof gray ,ity alone, flow through it. In fact, theinci sion can be made so fine that it is almost im- The [incision is made possible to detectit, b

eca-use the inherent resil iency lthematerial severed by the knife,

" returns severed parts into their original. p0- v sition before the slit wasmade and thus practically closes the slit 'lVhile itis not material how the pen'arm and pen point are formed, I have found that a good deal of care is necessary and the following is a descriptio n of aproces's employed ent sheet celluloid oi parent sheet celluloi of the arm for the reception of the pen. The pen points which are made from .005 transd-,- are formed in a hot mold or d-ie,-which contains any desired plurality of punches and die elements the co-opcrating members of which-may be held in cor I rect relation like.*

The sheet material from which the. pens by means of dowel pins 'or the are made,.are out up into small disks about in diameter and these disks are laid over i the dies and the brought down upon punches are carefully them; a

of the ptinch-block gr with. it except for a ception of the pen. After the pen cups adually allows the latter to sink into the dies carrying the material small margin which is left'to seat on the portion of the arm immediatelv around the holepunched for the. re

have been formed; they are set into theholes in the ends of the pen 7. arms and cemented with liquidic'elluloid or any other suitable After the connection solvent; to the latter. is 'made, each penpoint is placed over a cone conformingto'the shape of the punch andprovided with a fine slot eX- tending from its poi nt half way toward" the base. In this position the pen cups are slitted with a Very thin and asuitable holder for slot in the cone.

sharp knife mounted in motion in line with the Care must be taken not to drop the knife directly down upon the point of the pen cap, but to approach itw'ith a sliding motion similar to that of a saw. This precaution must be observed to avoid crushing of the point.

Byjthe process described, it is possible to provideapen arm and a penwh ch separately and together are extremely light, extremely simple and cheap.

Having, now special reference to Figure 3,

ness than the arm. 1.

which shows the preferred form of construction, 1" indicates a hole at the end of the arm 1. The pen cup Qiis formed of a sepa 7 rate piece of sheet material of smaller'thicle 'The, pen, cup 2 has a flange 2 by which it: is supported on the. arm, the pendcup ektending through the hole/1.

Thei'n-k isplacedinto the cup serving as a rcservolr.

As soon'as the pen is placedupon a chart and moved relatively thereto, the ink is dra n through the slit by capillary attraction and traces the record as intended.

The principal. advantage of the mechanism described is an exceedingly small resistance to movement over the record "chart. The point of the pen cupwhile sharp enough to define a thin record line, is sufficiently round- "ed to offer a smooth surface to tllQ ']DH-] )1'.

It-has' no sharp'edges or corners tending to scratch on or dig into the surface of the.

upon the'paperwhile the arm is sufficiently stifi' toavoid vibrations.

In other, words the pen can be maintained in contact relation .to the paper with a minimum of pressure.

The two advantages"mentioned are instru- "-.me1 1talin. providing a pen which offers a minimum of resistance'to movement.

therefrom and replaced by a new pen point,

The 'form shown in Figs; 4l-6 generally,

:similarl to the itorn'i shown in Figs 1 3. .However, the pen point 5 is provided sepa- -rately from the arm 6 and maybe detached It comprises a small strip 4 of sheetcelluloid having at one end the protuberance 5 slitted as previously described. Toward the other end,--the strip 4 has two transverse slits 7 and the portion intermediate the slits is pressed 0 cordingsphygmomanometer, but it is underout of the planeot the strip to provide a socket portion 8 for receiving thearm'6. i The pen mechanism described has been es pecially adapted foriuse as a part of a restood that it is ofgeneral application. 7

While, inthe form described, it is principally adapted fonmovement over a hori- Zontally disposed chart, the principle of the invention may be embodied in other forms,

as for instance for movement of the arm in a vertical plane, Y V

Although I have specifically finen'tioncd only celluloid, all composition materials having the physical characteristics of celluloid, are available forj'theipurposes of invention.

The. subject matter of the? application is disclosed in my application Serial No. 124,220

J fol-a Iaratus formeasurin ulsatin eurrents filed July 22, 1926. fI claim:

-1. A'pen consisting of a thin piece of composition material having substantially. the physical characteristics of celluloid, saidpiece ln'wing on one side an indentation defining a pointed protuberance on theotherside, the protuberance being provided 'with a finej incision extending inwardlvfrom the -pointi QKPen mechanism otthecharacter described, comprising an arm'ot a composition material having substantially the physical r-lmracteristics oil celluloid said arm ha ing protuberance on the other side. the protuberance being provided with atine incision extending inwardly from the point;

ononeside an indentation 'defininga pointed A pen consisting of a thin strip of Composition material having substant ally the 1 physicalcharaete'ristics of celluloid, said strip haying on one side an lndentation defining a pointed protuberance on the other side, the

protuberance being provided-with a fine incisi on extending inwardly from the point substantially at right angles to the strip;

4. A pen consisting of a piece having a thickness of about .01" ot a composition materialhavingg substantially the physical characteristics of celluloid,"said piece having on one sidean indentationdefining a pointed protuberance on the other side, the protuberance being; provided with a fine inci'sioneze tending inwardly from the point. 1

5. Pen mechanism of the character described, comprising an arm of a composition n'laterial' having substantially the physical properties o l celluloid, of a thickness of about .01, a piece of composition material having substantially the properties of celluloid, said piece having on one side'an indentation de- I lining a pointedprotuberance on the other side, of a thickness less than the thickness of the arm, the protuberance being provided with a fine incision extending inwardly from V the point. 1

6. Penv lIlQCllLIllSIIL of the. character described comprising, an arm of a composition material having. substantially the physical properties of celluloid, said ,striphaving 0n one side an indentation defining a pointed protuberanceon the other side, the arm having: a thickness of about .01 and the protuberance havinga thickness of about .005

and being provided with a fine incision extending inwardlyfrom the point scribed, comprising an arm of'a composition Wardly from the point, the said element having a smaller thickness than the arm and being unitedto the latter.

"8. In pen mechanism of the character de- 10 scribed, for comblnatlonwlth a pen arm, a r

nib of a composition material having substantially the comp'o'sition of celluloid, said nib consisting of a thin'piece of thematerial formed to. define an indentation on one side. v and a pointed protuberance onthe other side, 15 H V the protuberance being provided with "a fine incisionextending' inwardly from the point. p

In testimony whereof l 'alfix my signature.

GEORGE, IRELAND. 

